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Graphite Electrodes RP 500-700 mm

Jun 18, 2020 Source: DanCarbon Writer: Amanda

Graphite electrodes RP 500~700 mm are made of mixed petroleum coke and coal pitch, to be extruded, baked, impregnated, graphitized and machined for use as conductive material on EAF (Electric Arc Furnace) and LF (Ladle Furnace) for steelmaking.
In the steelmaking process, the EAF method recycles used iron scrap by melting it at a temperature of about 1600 ℃ in an electric arc furnace. Graphite electrodes, a kind of conductor, are an essential component in this kind of furnace.
RP Graphite electrodes Standards
IEC 60239 Graphite electrodes for electric arc furnaces – Dimensions and designation
YB/T 4088 Graphite electrode
YB/T 4089 High power graphite electrode
YB/T 4090 Ultra high power graphite electrode
RP Graphite electrodes Properties
Property Unit Electrode Diameter
RP
500~700 mm
(20~28 inch)
Bulk Density g/cm3 1.54~1.62
Specific Resistance μΩm 7.5~9.5
Flexural Strength MPa 6.5~8.5
Elastic Modulus GPa 6.5~9.0
Coefficient of  ×10-6/°C 2.0~2.4
Thermal Expansion
Ash Content % Less than 0.2
RP Graphite electrodes Diameters and Lengths of Electrodes
Nominal Actual Diameter Specifications Nominal Actual Length Specifications for Normal Electrodes Actual Length Specifications for Short Electrodes
Diameter Max Min Length Max Min Max Min
mm (inch) mm mm mm mm mm mm mm
500 -20 511 505 1800 1900 1700 1700 1525
2100 2200 2000 2000 1825
2400 2500 2300 2300 2125
550 -22 562 556 2100 2300 1950 1950 1800
2400 2600 2250 2250 2100
2700 2900 2550 2550 2400
600 -24 613 607 2100 2300 1950 1950 1800
2400 2600 2250 2250 2100
2700 2900 2550 2550 2400
650 -26 663 659 2400 2600 2250 2250 2100
2700 2900 2550 2550 2400
3000 3200 2850 2850 2700
700 -28 714 710 2400 2600 2250 2250 2100
2700 2900 2550 2550 2400
3000 3200 2850 2850 2700
Notes:
1.      A low spot may be accepted only if the diameter measured at the low sport is not more than 3 mm below the min diameter specification.
2.      Each shipment contain 5% short electrodes may be accepted unless the acceptable percentage of short electrodes per delivery is decided by agreement between the supplier and user. 
RP Graphite electrodes Dimensions of Pins and Sockets (T3)
Nominal IEC Pin Socket
Diameter of Electrodes Designation of Joint Major Diameter Pitch Diameter Length Minor Diameter Pitch Diameter Depth
    d1 d2 l1 d3 d4 l2
mm (inch) Type T3 mm mm mm mm mm mm
500 -20 273T3N 273.05 268.84 355.6 264.62 268.84 183.8
500 -20 298T3N 298.45 294.24 372.6 290.02 294.24 192.2
550 -22 298T3N 298.45 294.24 372.6 290.02 294.24 192.2
Notes:
1.      Type T3 is 3 taper threads per inch, pitch 8.47 mm.
2.      Pin pitch diameter is equal to socket pitch diameter (d2 = d4).
3.      Socket minor diameter is equal to pitch diameter (d3 = d4 – 4.22).
RP Graphite electrodes Dimensions of Pins and Sockets (T4)
Nominal IEC Pin Socket
Diameter of Electrodes Designation of Joint Major Diameter Pitch Diameter Length Minor Diameter Pitch Diameter Depth
    d1 d2 l1 d3 d4 l2
mm (inch) Type T4 mm mm mm mm mm mm
500 -20 269T4N 269.88 266.72 355.6 263.56 266.72 183.8
500 -20 269T4L 269.88 266.72 457.2 263.56 266.72 234.6
550 -22 298T4N 298.45 295.29 355.6 292.13 295.29 183.8
550 -22 298T4L 298.45 295.29 457.2 292.13 295.29 234.6
600 -24 317T4N 317.5 314.34 355.6 311.18 314.34 183.8
600 -24 317T4L 317.5 314.34 457.2 311.18 314.34 234.6
650 -26 355T4N 355.6 352.44 457.2 349.28 352.44 234.6
650 -26 355T4L 355.6 352.44 558.8 349.28 352.44 285.4
700 -28 374T4N 374.65 371.49 457.2 368.33 371.49 234.6
700 -28 374T4L 374.65 371.49 558.8 368.33 371.49 285.4
Notes:
1.      Type T4 is 4 taper threads per inch, pitch 6.35 mm.
2.      Pin pitch diameter is equal to socket pitch diameter (d2 = d4).
3.      Socket minor diameter is equal to pitch diameter (d3 = d4 – 3.16).
RP Graphite electrodes Tolerances for Sockets and Pins
Dimension Tolerances for Sockets and Pins
(tolerance in brackets are informative only)
Min Max
(mm) (mm)
Length of pin l1 (-4) 0
Depth of socket l2 -3 (+10)
Length of thread l3 -2 (+8)
Recess of pin l4 0 10
Recess of socket l5 0 4
Pitch diameter of pin d2 (-1) 0
Pitch diameter of socket d4 0 (+0.5)
RP Graphite electrodes Designation
Electrodes shall be designated by the nominal diameter, the nominal length and the socket designation.
EXAMPLE 1 Designation of electrodes with normal sockets:
500 × 2100 × 269T4N
EXAMPLE 2 Designation of electrodes with long sockets:
650 × 2400 × 355T4L

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